Boat docking backstop



FIG. 1 is a front perspective view of a boat docking backstop (with boat dock shown in broken lines);

FIG. 2 is a left side elevation thereof (with a boat and boat dock shown in broken lines);

FIG. 3 is a front elevation thereof;

FIG. 4 is a rear elevation thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines represent the environment in which the article resides and form no part of the claim. 

CLAIM The ornamental design for a boat docking backstop, as shown and described. 